Light Source

The speed at which light waves propagate in vacuum is independent both of the motion of the wave source and of the inertial frame of reference of the observer. This invariance of the speed of light was postulated by Einstein in 1905, after being motivated by Maxwell's theory of electromagnetism and the lack of evidence for the luminiferous aether; it has since been consistently confirmed by ...

The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them.

To me, baring a shoulder or two will always be timeless, classy ways to expose a little of that so erogenous zone, trending or not. However the latter happens to be on the radar right now, and so easy to achieve by playing around with classic shirts and cut out tops.